Remove QtDeclarative compatibility module

Remove QtDeclarative compatibility module

When the QtDeclarative module was renamed to QtQml, a compatibility
module was introduced to avoid disrupting downstream projects.
Time has passed, and it's now appropriate to remove this module.

Existing projects that haven't ported can still use the
bin/rename-qtdeclarative-symbols.sh script to ease the porting.

Change-Id: I05a9727013d9e38c2262577f68260a4382bfbeea
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Matthew Vogt <matthew.vogt@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Donald Carr <donald.carr@nokia.com>